Civil War: X-Men

On the completely opposite end of the close-knit tie-in spectrum is the 4-part Civil War: X-Men (now available in trade format. If you are a casual reader who only came on-board with the Civil War event, this is probably one of the least important to read. If you were in it for the last few years however, this story follows-up on the events that have been unfolding ever since the aftermath of Avengers: Disassembled.

The last surviving mutants on the planet have gathered at the X-Mansion for protection and have formed a loose fraternity known as "The 198." The X-Men themselves however have reluctantly agreed to allow the government keep watch over them all with a special task force of Sentinels. However, this move has essentially turned the X-Mansion, once a refuge, into a concentration camp. Faced with public outcry over costumed heroes and the resulting Civil War, the X-Men publicly chose to remain neutral.
However, life goes on and Bishop, himself a legal officer of the law, is recruited to help Valerie Cooper and the Office of National Emergency when The 198 stage a riot and escape from the X-Mansion compound. Cyclops, believing nothing good will come of Bishop's mission, leads an X-Men team on their own "rescue" attempt for The 198. The one oddity about the tale is that due to the nature of the plot (the X-Men dealing with a government entity) it has tends to present a biased view in favour of the pro-registration camp despite a cameo with Captain America, the story ends with team of registered heroes led by Iron-Man arriving on the scene to help sort out the mess.

The Marvel Universe is vast and it's impossible to orchestrate a single world-shaking event that will directly affect every single character. The X-Men were addressed in the pages of the main Civil War arc, but once they established this position on the matter, they disappear after only a few panels hinting at the tension between Bishop and Cyclops. This story takes those few panels and explodes them into full form. I have only good things to say about how Marvel has managed to follow-up with the huge events from House of M (and the accompanying Decimation stories) and to tie the aftermath into the backdrop provided by Civil War, which when stripped down to basics, doesn't really involved the X-Men much at all.